Cook Islands weather in December 2025

Expect 28°C daytime maximum temperatures in the shade in Cook Islands in December based on long-term weather averages. There is usually 11 days with some rainfall and 229 mm of average monthly rainfall in December.

  • 28°C maximum daytime temperature in December in Cook Islands (Avarua)28
    28°C max day temperature
  • 11 days with some rainfall in December in Cook Islands (Avarua)11
    11 days with some rainfall
  • 22°C minimum night-time temperature in December in Cook Islands (Avarua)22
    22°C min night temperature
  • 13 hours of daylight per day in December in Cook Islands (Avarua)13
    13 hours of daylight per day
  • Moderate heat & humidity in December in Cook Islands (Avarua)M
    Moderate heat & humidity
  • 229 mm monthly rainfall in December in Cook Islands (Avarua)229
    229 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in December in Cook Islands (Avarua)11
    11+ (Extreme) UV index
  • 26°C sea temperature in December in Cook Islands (Avarua)26
    26°C sea temperature

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The December weather guide for Cook Islands (Avarua) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Cook Islands destinations

Below are average maximum temperatures at popular countries, regions and places in the Cook Islands in December. Select a holiday destination to see more weather parameters.

All Cook Islands destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in the Cook Islands in December?

Daytime temperatures usually reach 28°C in Avarua, Cook Islands in December with moderate heat and humidity, falling to 22°C at night.

How warm is the sea around the Cook Islands in December?

The average sea temperature around Avarua, Cook Islands in December is 26°C.

Does it rain in the Cook Islands in December?

There are usually 11 days with some rain in Avarua, Cook Islands in December and the average monthly rainfall is 229mm.

Cook Islands December sunrise & sunset times

Browse the sunrise and sunset times for Cook Islands in December 2025. Select a month to view Cook Islands sunrise and sunset times for the next 12 months. The Cook Islands sunrise and sunset times shown below are for Avarua.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 05:48 19:08
Tuesday, 16th December 2025 05:52 19:18
Wednesday, 31st December 2025 06:00 19:24

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